Figure 7: Enhancement ratio for 3-element arrays when the dipolar source is oriented along the alignment axis of the dimers (solid line) and perpendicularly to the alignment axis (dashed line), which is labelled as xpol. The disc dimer case (blue line) and the bowtie case (red line) are plotted as a function of the interelement distance 𝑑, for a radius 𝑟=40nm and 𝑔𝑎𝑝=5nm.